SUMMARY
If a message cannot be successfully delivered, the Microsoft Mail
Gateway to SMTP or Microsoft Mail may generate a message from
"Network/Postoffice/Postmaster," advising the sender of a problem.
These messages can sometimes get bounced back and forth between Microsoft
Mail and the SMTP environment if the sender or recipient names are invalid.
To stop this bouncing phenomenon, (also called looping or ping-pong) the
SMTP Gateway replaces "Network/Postoffice/Postmaster" with "<>" (Greater-
than and Less-than signs).
The message is not returned to the Microsoft gateway because the SMTP
host does not have a valid address to send the mail message back to; it
is sent to the administrator for the Microsoft gateway.
Example
OUTGOING MESSAGES:
If an outgoing message is from:
Network/Postoffice/Postmaster
The SMTP Gateway replaced it with:
INCOMING MESSAGES:
If an incoming message is from:
The SMTP Gateway replaced it with:
Network/Postoffice/Postmaster